Diazo dyes for nylon

ABSTRACT

COMPOUNDS OF THE FORMULA   1-A,(HO3S-),2-((2-B,4-((E,((4-R-PHENYL)-SO3-)PHENYL)-   N=N-),5-B1-PHENYL)-N=N-)BENZENE   WHEREIN A IS HYDROGEN, LOWER ALKYL SUCH AS METHYL, ETHYL OR PROPYL, LOWER ALKOXY SUCH AS METHOXY, ETHOXY OR BUTOXY, OR CHLORINE; B AND B1 ARE HYDROGEN, LOWER ALKYL SUCH AS METHYL, ETHYL OR BUTYL, OR LOWER ALKOXY SUCH AS METHOXY, ETHOXY OE BUTOXY; E IS HYDROGEN, LOWER ALKYL SUCH AS METHYL, EHTYL OR BUTYL, OR LOWER ALKOXY SUCH AS METHOXY, ETHOXY OR BUTOXY; R IS HYDROGEN, METHYL OR CHLORINE AND   (4-R-PHENYL)-SO3-   IS EITHER ORTHO OR PARA TO THE AZO LINKAGE; AND SO2H IS EITHER META OR PARA TO THE AZO LINKAGE, PROVIDE YELLOW TO SCARLET SHADES OF GOOD FASTNESS AND DYEING PROPERTIES AND EXCELLENT LEVELING CHARACTERISTICS ON NATURAL AND SYNTHETIC POLYAMIDE FIBERS.

United States Patent 3,594,363 DIAZO DYES FOR NYLON Hans Alfred Sting], Broolrside Heights, Toms River, N..l., assignor to Toms River Chemical Corporation, Toms River, NJ. No Drawing. Filed July 10, 1968, Ser. N0. 743,630 Int. Cl. D091) 31/12; D06p 1/02 US. Cl. 260-186 6 Claims ABSTRACT OF THE DISCLOSURE Compounds of the formula rine and is either ortho or para to the azo linkage; and SO H is either meta or para to the azo linkage, provide yellow to scarlet shades of good fastness and dyeing properties and excellent leveling characteristics on natural and synthetic polyamide fibers.

BACKGROUND OF THE INVENTION The use of monoazo-dyestuifs containing a sulfonic acid group for the dyeing of animal fibers and artificial fibers of superpolyamides or superpolyurethanes is known. However, the dyeing of nylon presents particular problems in obtaining good leveling and the achievement of optimum leveling is a very important consideration in the dyeing or printing of nylon in order to cover up irregularities.

SUMMARY OF THE INVENTION The present invention relates to and has for its objects the provision of dyestuffs particularly suited for the coloring of nylon fibers.

In accordance with the present invention it has been found that valuable dyeings are obtained on natural and synthetic polyamide fibers by the use as dyestulfs of disazo compounds of the formula 3,594,363 Patented July 20, 1971 ice The compounds of the present invention are prepared according to known procedures by diazotizing unsubstituted or properly ring-substituted metanilic or sulfanilic acids, coupling the diazotized compound with an arylamine or its N-methane-sulfonic acid such as aniline omega acid, following with an alkali treatment in case of N-methane-sulfonic acid, rediazotizing the p-aminoazo compound, coupling the rediazotized product with a phenolic compound such as phenol, cresol or methoxy-phenol, followed by benzenesulfonylation, such as tosylation, of the product to provide the novel dyestuif of the present invention.

The dyestuffs of the present invention can be employed in the form of their salts, for example, in the form of the ammonium or alkali metals, such as sodium, potassium or lithium salts.

The disazo-dyestuifs of the present invention can be used for dyeing or printing a very wide variety of materials, principally for dyeing animal fibers such as leather, silk and especially wood and for dyeing artificial fibers of superpolyamides or supcrpolyurethanes. The dyeings obtainable therewith are distinguished by the purity and brightness of their tints, by excellent properties of fastness to alkali, light and washing and by good leveling and transfer properties.

The dyes of the present invention show very good exhaustion from a neutral dye-bath and provide dyeings over a shade range from yellow to orange.

The dyes will also dye well in combination, especially with the use of a leveling agent. If desired, a conventional after-treatment can be given to the dyed material.

The following examples illustrate the invention.

EXAMPLE 1 (A) 17.3 grams of metanilic acid are dissolved in 70 grams of water by addition of 8 grams of 50% by weight caustic soda solution. Ice, 22 grams of concentrated hydrochloric acid, and a solution of 7 grams of sodium nitrite in 20 grams of Water are added to achieve diazotization at 0-3 C.

(B) 15.3 grams of 2,5-dimethoxyaniline, dissolved at C. in 120 grams of water and 11 grams of concentrated hydrochloric acid, are combined with the diazotized metanilic acid and enough ice to keep the temperature below 5 C. and the pH is raised to 2.5 with 20% soda ash solution. After completion of the coupling, the product is dissolved at pH 9 with caustic soda solution and then salted with 50 grams of sodium chloride. Rediazotization is accomplished by addition of 7.5 grams of sodium nitrite followed by an aqueous solution of 21 grams of naphthalene-sulfonic acid and suflicient sulfuric wherein A is hydrogen, lower alkyl such as methyl, ethyl acid to establish a congo acid reaction. A temperature of rine and is either ortho or para to the azo linkage; and SO H is either meta or para to the azo linkage.

32 C. is maintained for 2 hours.

(C) This reaction mass is added during one hour to a solution of 9.4 grams of phenol, 3 grams of caustic soda, and 25 grams of soda ash in 200 grams of water while the temperature is held below 5 C. by addition of ice.

The resulting slurry is stirred for 2 hours, neutralized with hydrochloric acid, and filtered.

(D) The filter cake is dissolved in 500 grams of water at 0, containing 4 grams of caustic soda and 5 grams of soda ash. 20 grams of crushed p-toluenesulfochloride are added and the thickening reaction mass is stirred for 3 4 30 minutes at 8085 C. The pH is raised to with caus- EXAMPLE 4 tie soda and the product is isolated by filtration. The filter 17.3 grams of sulfanilic acid are diazotized in 50 grams Cake iS Washed h 1% brine and dfled t0 glVe a Product of ice water and 11 grams of concentrated hydrochloric 0f the formula acid by the rapid addition of a concentrated solution of is OsNa ooh The produc y ny n fr m n l Weakly i y 7 grams of sodium nitrite in water at 0 to 8 C. The diazobaths s t s shades of good llght and wash fasttized sulfanilic acid is combined with 13.7 grams of 2- 11655 p p methoxy-S-rnethylaniline as described in Example 3. The EXAMPLE 2 coupling product is acidified with hyrdochloric acid the The procedure of Exam le 1 i re eated replacing th 15 next morning and isolated by filtration. The filter cake phenol in Example 1 with 12.4 grams of meta-methoxyis dissolved at pH 8.0 in 250 grams of water at 50 C. with phenol, yielding a product of the structure: caustic soda. 10 grams of sodium naphthalenesulfonate ()CII some (hCHs 0on The product dyes nylon reddish-orange shades of good and 7 grams of sodium nitrite are added. The total preplight and wash fastness. aration is gradually added to 200 grams of cold water EXAMPLE 3 contalnlng 45 grams of concentrated hydrochloric acid and stirred for one hour at C. It is then added during 17.3 grams by weight of metanilic acid are diazotizcd one hour to a solution of 9.4 grams of phenol, 6 grams of by the procedure of Example 1A. caustic soda, and 25 grams of soda ash in 200 grams of 1 grams of Z-methOXY-S-methYIaniline, dissolved at 30 Water while the temperature is held below 5 c. by addi- C. in 120 grams of water and 11 grams of concention of ice. The resulting slurry is stirred for 2hours, salted trated hydrochloric acid are combined with the diazotized with 120 grams of sodium chloride, and filtered. metanilic acid and enough ice to keep the temperature be- The filter cake is toslyated as described in Example 1D. low 5 C. The pH is then gradually raised to 3.0 with The product obtained has the formula 20% soda ash solution. The coupling product is filtered off and dyes nylon yellow'orange Shades of good light and the next morning and subsequently dissolved in 500 grams Wash fastnessof Water at C. by addition of 8 grams of 50% by EXAMPLE 5 weight caustic soda solution. The solution is salted with 1 grams f t ili i are diazotized by the 28 grams of s p phlorlde and cooled to cedure of Example 1A. The pH of the resulting solution grams 0f s0d1un1 mtrlte are added, followed y an q is then raised to 2.5 with sodium bicarbonate; 6.6 grams Ous solution of 21 grams of naphthalenesulfonic acid and f Sodium acetate are added, followed quickly by 225 sufficient sulfuric acid to establish a congo acid reaction. grams f i jd l N th lf i acid while the e hour later an amount Of Sodium chloride Weight perature is held at 54 C. by adding ice and cold water. units) equivalent to 20% of the volume of the slurry 1s 50 Aft i i f one hour, 3 grams f 50% by Weight added h Y Cooled to caustic soda solution is added and the mass heated at 100 The Preclplmte 15 Collected y filtratfohr Feslufrled In C. for 8 hours. It is then cooled, its pH reduced below 10.0 250 grams of Cold Water and addfid dllrlhg one to a with 28 grams of sodium bicarbonate, salted with 33 grams solution of 9.4 grams of phenol, 3 grams of caustic soda f Sodium Chloride, and filt L and 20 grams of Soda ash in 200 grams of Water While 55 The filter cake is dissolved neutral in 800 grams of holding the temperature below 5 C. by addition of ice water t 30 C T th oluti are dd d 7 grams of maihtaihihg a Sandy form y addition of 7 grams of sodium nitrite followed by an aqueous solution of 21 sodlum Ch T hours later the Couphng Product grams of naphthalene-sulfonic acid and sufficient sulfuric 1s lsolatedhy filtrahonacid to establish a congo acid reaction. A temperature of Tosylatron of the filter cake is carried out as described is maintained f 2 hours This reaction mass is m Ex mpl combined with phenol as described in Example 1C. The

The Product Isolated has the formula tosylation procedure of Example 1D is followed with the some $011 and dyes nylon clear level shades of yellow-orange of very isolated intermediate product. The product obtained has good light and wash fastness. the formula OCHS S Uri-Na 5 6 and dyes nylon bright reddish-yellow of very good light and wash fastness.

Following the procedure set forth in Example 1 and employing the appropriate end couplers, the following compounds providing reddish-orange shades of good light 5 and wash fastness are obtained:

EXAMPLE 6 OCH; CH:

S OsNB OICH;

EXAMPLE 7 (i) CH; (3H3 S OaNa 0 CH3 OSOz CH EXAMPLE 8 (|)CH3 ([3 CH3 The following examples illustrate further-but by no means limitthe scope of this invention:

EXAMPLE 10 (|)CH3 N30; S -N=NC N=NC O S Oz-O-CH; reddish-yellow EXAMPLE 11 0on3 3H3 -N=N -n=n reddish-yellow soma Ha o-s m-O-om- EXAMPLE 12 v CH3 ON=N-N=NOS 00-01 13 reddish-yellow S OaNa I EXAMPLE 13 mm mm OCH: -N=N.N=N@0 S0r m S OaNB EXAMPLE 14 OH; QN=NQN=N 3O-SO: orange 3 03m. CH3

EXAMPLE 15 OCH:

| 1 Nao's Q =NOO-S DIG-CH3 reddish-orange wherein A is hydrogen, lower alkyl, lower alkoxy or 3. A compound according to claim 1 having the chlorine, B and B are hydrogen, lower alkyl or lower formula OCH;

alkoxy, E is hydrogen, lower alkyl or lower alkoxy, R is hydrogen, methyl or chlorine, the group 10 4. A compound according to claim 1 having the RS 020- formula S OaNa is ortho or para to the azo linkage and the group --SO H is meta or para to the azo linkage and their alkali metal 20 5. A compound according to claim 1 having the and NH salt. formula (3H3 OCHQ 2. A compound according to claim 1 having the formula OCH;

oaNa OCH:

\ 5 6. A compound according to claim 2 having the formula OCH; OCH; CH;

References Cited UNITED STATES PATENTS 3,310,550 3/1967 Liechti 260-186X CHARLES B. PARKER, Primary Examiner D. M. PAPUGA, Assistant Examiner US. Cl. X.R. 8-54, 162, 17s 

